@gopinath Welcome to QOTO and Mastodon, Gopinath.

The software is very similar in usage to twitter, you can post updates, any interesting links to other places, videos, photos, etc. You can follow users with interesting content, and Boost one of their posts if you like it (same as retweet),

There's no Like button, but the Star button is Favourite, which does the same thing.

The main difference of this whole network is that its not under control of one company or administrator - different servers are run by different people, some have certain themes, this one is more science, math and engineering oriented.

You can read posts made here under the "Local"tab, or the larger stream of posts from many other places under the "Federated" tab.

A post made here will spread, and you might get responses from people in any of the other "instances" (separate servers).

Have fun and enjoy.